On Mar 3, 2015, at 18:49 , Stephen John Smoogen wrote:

> On Mar 3, 2015 8:49 AM, "P. Larry Nelson" <[log in to unmask]> wrote:
>> 
>> I am seeing a bizarre bug where an SL6.x system hangs on either
>> shutdown or reboot at the point where it wants to shutdown the
>> loopback interface.
[...]
>> [ok, here is where it becomes bizarre]
>> Modify /etc/nsswitch.conf to switch the order of "files nis" to
>> "nis files" for passwd, shadow, and group, as I've always done.
>> Reboot.  Boom!  It hangs at loopback interface shutdown!
> 
> I want to thank you for giving all the details of your testing. I would
> like to use it as a future example of how to be constructive and helpful to
> other people needing help.

Indeed.

> So have you looked at nscd any? Does having nscd turned on or off alter
> this problem. Also what is in hosts and is the NIS server listed. Thanks

And are you sure it's only passwd/group/shadow you set to "nis files"? Nothing else, in particular not hosts or ethers?

Interesting issue ;-)